The Change(1997)

Tobias has pretty much gotten used to his life. He's a red-tailed hawk with the mind of a kid. It was weird when he first got trapped in morph. But now it's almost okay. After all, how many kids actually get the chance to fly?

Now Tobias is about to make a very special choice. A choice that the other Animorphs and Ax know nothing about. And it could mean the difference between being a hawk. . . and being human. . . .